Eli5: What’s the mechanism by which a multitude of voices become LOUDER and can be heard farther, than a lone voice at the same source?

Question

I live close enough to a sports stadium to occasionally hear the roar of the crowd. But that’s just a bunch of individuals all yelling and making various noises. If that were single individual in the same stadium, I wouldn’t be able to hear anything. Do our voices amplify each other somehow, when in a group?

In: 13

Answer 1

It’s called constructive interference. The sound waves of each person add together and increase the volume.